The PEAR MDB2 package: Download a portable merge of the PEAR DB and Metabase PHP database abstraction layers for a common API for all supported RDBMS.
PEAR MDB2包：下载可移植的PEAR DB和Metabase php数据库抽象层的合并包，提供所有受支持RDBMS的通用API。
The second application of layers acted as a stepping-stone to a final, UML package-based approach.
分层的第二项应用是作为最终的、基于 UML 包的方法的中间步骤。
In this course, the software layers are defined as a specific software package and functionality.
在本课程中，软件层定义为一个特定的软件包和功能。
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